Monday 2:20pm: Eastern Winter Storm

This is a "storm total" forecast map. There is a very sharp gradient on the east side of the forecast snow field due, in part, to elevation and to the fact it has been mild before the cold air moves in. So, for example, it may be primarily rain at Reagan Airport with light accumulations with significantly heavier accumulations at Dulles.

Timing: The snow will begin in western North Carolina and western Virginia during the pre-dawn hours Thursday Wednesday and then spread rapidly northeast.

My advice is unchanged: Even if it is just rain and gusty winds at your destination airport, earlier is better.